Malicious PDF — malware analysis report

Static analysis result for SHA-256 62669c81b6b2b80a…

MALICIOUS

PDF

76.7 KB Created: 2021-10-16 13:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cbe6b224257dfdf3c9e7067a672d342a SHA-1: c8483ef1036aa4c93e42dee10a4531e36bbd5c23 SHA-256: 62669c81b6b2b80adb5b7f4695621950006206641640d8d6f7e44b94c8f2f684
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and does not provide direct clues, but the presence of embedded URLs and the overall structure point towards a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=physics+viva+questions+and+answers PDF link annotation
    • http://herborgthailand.com/file_media/file_image/file/juxowu.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/dijowokasa.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/suvujinajoriri.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/11994279924.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16155749c222fa---22055636646.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/tojarusiladozetesa.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/janevegunolezekaraz.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/58088262571.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4e3defa7a4afcbd88de6f373fd2781e1/japukewisuxeravalo.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/jogakiganunulutaze.pdfIn PDF document text
    • https://amgaa.org/temp/files/71929335585.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/98989065716.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/33196835341.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/57354794472.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142902779555---fipoxorivilawafafepa.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/56484516244.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/gavimasepexen.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/mozuruwarawewok.pdfIn PDF document text
    • http://roocenter.ru/upload/file/14797737617.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161544a2b64e54---72171009193.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/zulasutogoligeragimemup.pdfIn PDF document text
    • http://parfumland.sk/upl/figenawon.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/17471480167.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1615f01811d0de---risunoxotuwovufa.pdfIn PDF document text
    • http://dichthuatanhduy.com/uploads/userfiles/file/1797071869.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 10932 bytes
SHA-256: 45004cd1960273eaaa447f6d95e3c0961a526e7497972395b3908d96070e3c0a
font_02_sfnt_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 17100 bytes
SHA-256: ae5cfcc95ff005c2809872924ee0b7d19db1355753b95d06f663f5409a7890d9

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